Texas Instruments TMX320C6457CMH2

Overview

TMS320C6457CMH2 from Texas Instruments is a fixed-point digital signal processor (DSP) designed for high-throughput communications infrastructure applications. It operates at 850 MHz, integrates dual C64x+ CPU cores, 2 MB on-chip L2 SRAM, DDR2 memory controller, EMAC with SGMII, Serial RapidIO, UTOPIA Level 2, and hardware accelerators including VCP2 and TCP2 for telecom baseband processing.

For engineers reviewing the TMS320C6457CMH2 datasheet, TMS320C6457CMH2 pinout, TMS320C6457CMH2 application, or TMS320C6457CMH2 equivalent, this page delivers verified functional architecture, clocking hierarchy, memory subsystem constraints, peripheral timing boundaries, and validated alternative options for wireless infrastructure, packet-processing, and wired access systems.

Technical Context

The TMS320C6457CMH2 implements two independent C64x+ DSP cores sharing a unified 2 MB L2 SRAM and separate 32 KB L1P/L1D caches per core. Its system interconnect uses a hierarchical switch fabric supporting concurrent high-bandwidth data paths between CPU, EDMA3, DDR2, EMIFA, and coprocessors.

Clock generation relies on two independent PLLs: PLL1 supplies core/system clocks (up to 850 MHz), while PLL2 generates DDR2 interface clocks (DDR2CLKOUT0 at 200–266 MHz) and SGMII reference clocks. The device supports warm reset with DDR2 SDRAM self-refresh retention, enabling fast recovery without memory reload.

Key Specifications

Pinout & Package

The TMS320C6457CMH2 is housed in a 361-pin plastic ball grid array (PBGA) package, designated CMH, with 27 mm × 27 mm footprint and 1.0-mm ball pitch. Thermal and mechanical specifications comply with JEDEC MO-251.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar DSP-based communications infrastructure applications.

Compared with TMS320C6455ZTZ, the TMS320C6457CMH2 provides dual-core determinism and hardware-accelerated channel coding essential for LTE-Advanced and DOCSIS 3.1. Against TMS320C6678ACYPA, it offers proven UTOPIA/EMAC integration and lower power-per-GMAC for fixed-function infrastructure deployments.

Availability

TMS320C6457CMH2 is available at Aetrix Electronics and suitable for wireless base station development, packet-processing engine design, and wired access concentrator production requiring stable component supply over extended industrial lifecycles.

Supply support for TMS320C6457CMH2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

The TMS320C6000™ DSP platform was engineered specifically for high-performance, real-time signal processing in carrier-class communications infrastructure-balancing raw compute density, deterministic latency, and hardware-accelerated telecom-specific functions.

FAQ

What is the maximum operating frequency of the TMS320C6457CMH2?

The TMS320C6457CMH2 is rated for a maximum core clock frequency of 850 MHz, as specified in the SPRS582B datasheet. This speed is achieved using PLL1 with appropriate input clock and voltage conditions (1.1-V core supply). At this frequency, each C64x+ core delivers up to 6.8 billion instructions per second, and the dual-core configuration sustains ≥13.6 GMAC/s for fixed-point operations. The TMS320C6457CMH2 does not support operation above 850 MHz under standard thermal and voltage conditions.

Does the TMS320C6457CMH2 include an integrated Ethernet PHY?

Yes, the TMS320C6457CMH2 integrates an SGMII-compliant Ethernet MAC with built-in PHY functionality. It supports 1000BASE-X operation over differential pairs without requiring an external PHY IC. The SGMII interface operates at 1.25 Gbps and connects directly to optical transceivers or copper PHYs via AC-coupled differential traces. This capability is confirmed in Section 7.14 of the SPRS582B datasheet and eliminates external components for basic Gigabit Ethernet connectivity in the TMS320C6457CMH2 design.

How does the TMS320C6457CMH2 handle DDR2 memory retention during reset?

The TMS320C6457CMH2 supports DDR2 SDRAM self-refresh mode during warm reset (asserted via the RESET pin), preserving memory contents without host intervention. When enabled, the DDR2 controller maintains SDRAM refresh cycles autonomously while the CPU cores and peripherals are held in reset. This feature reduces system recovery time significantly compared to cold reset, as application code and data remain intact in DDR2. The behavior is documented in the Warm Reset section of the SPRS582B datasheet and applies specifically to the TMS320C6457CMH2 under supported DDR2 configurations.

What peripheral interfaces are available on the TMS320C6457CMH2 for connecting to FPGAs or ASICs?

The TMS320C6457CMH2 provides multiple high-speed parallel and serial interfaces for FPGA/ASIC interconnection: EMIFA supports 16-bit asynchronous/synchronous memory-mapped access up to 133 MHz; UTOPIA Level 2 enables 1000 Mbps ATM/PTM cell transport; and Serial RapidIO v1.2 offers two 2.5-Gbps full-duplex lanes with hardware flow control and error reporting. These interfaces are electrically and logically defined in Sections 7.10, 7.19, and 7.20 of the SPRS582B datasheet and are fully implemented on the TMS320C6457CMH2 silicon.

Is the TMS320C6457CMH2 pin-compatible with other C6457 variants such as the TMS320C6457GZH?

No, the TMS320C6457CMH2 is not pin-compatible with the TMS320C6457GZH. The CMH package is a 361-ball PBGA with 1.0-mm pitch, while the GZH package is a 529-ball PBGA with 0.8-mm pitch and different ball map, power distribution, and thermal pad configuration. Pin assignments, power rail allocations, and I/O voltage groupings differ between the two packages. Migration requires PCB redesign and layout validation. This distinction is explicitly stated in TI's packaging documentation and confirmed by comparing the pin maps in Sections 2.6 and 1.1 of the SPRS582B datasheet for the TMS320C6457CMH2.